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OPA4180 输入正端与反端相互影响是什么原因,求助!

Other Parts Discussed in Thread: OPA4277, OPA4180

电路图如下:

当正端输入为0V时,反端电压量测等于我设定的2V,当正端电压为-14V时,反端电压变为-6V左右。更换OPA4180一样,更换OPA4277后,反端电压会有所变化,但仍然负值,不是正常的2V,更换为TI084C后正常,麻烦哪位大神指点一下原因,是否与输入级的电路设计有关? 另外几个运放的输入电流都是nA级  OPA4180 是1.7nA(max)   OPA4277是2.5nA(max)